Downhole abrading tools having excessive wear indicator
a technology of excessive wear and abrading tools, which is applied in the direction of earth drilling tools, borehole/well accessories, survey, etc., can solve the problems of restricted flow of drilling fluid through the outlet of drilling fluid passageways, wear of cutting ends, etc., and achieve the effect of effective and efficient identification of excessive wear
Inactive Publication Date: 2008-01-03
BAKER HUGHES INC
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- Abstract
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- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0014]The downhole abrading tools and methods of indicating to an operator of a downhole abrading tool of excessive wear on a cutting end of the downhole abrading tool have the advantages of providing effective and efficient identification of excessive wear on the downhole abrading tool.
Problems solved by technology
As the downhole abrading tool abrades the object in the well, the cutting end is worn away.
As a result of this pressure differential, the valve is actuated such that the flow of the drilling fluid through the outlets from the drilling fluid passageway is restricted.
Method used
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[0023]Referring to FIG. 1, oil and gas wells 10 have surface location 11 and downhole location 12. Object 13 is disposed within well 10. Downhole abrading tool 20 is connected to rotating component 15 which, together with downhole abrading tool 20, is part of drill string 16. Downhole abrading tool 20 is placed in contact with object 13 and then rotated, using equipment known to persons skilled in the art, to abrade object 13.
[0024]As shown in FIGS. 1-5, downhole abrading tool 20 includes body 21, having first end 22, cutting end 23, head 24, and drilling fluid passageway 26. First end 22 is adapted to be connected to rotating component 15 or drill string 16 to facilitate rotation of downhole abrading tool 20. First end 22 preferably includes threads (not shown) to facilitate attachment to rotating component 15 or drill string 16.
[0025]Drilling fluid passageway 26 is disposed longitudinally within body 20 to permit drilling fluid to flow through downhole abrading tool 20. Accordingl...
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A downhole abrading tool having a body with a first end for connection to a drill string, a cutting end, a drilling fluid passageway, a restrictor disposed within drilling fluid passageway, and an indicator chamber is disclosed. Upon exposure of the indicator chamber to a well environment due to excessive wear on the cutting end, the restrictor is actuated. Actuation of the restrictor restricts the flow of drilling fluid from the drilling fluid passageway into the well environment. The restriction of flow of drilling fluid from the drilling fluid passageway causes a pressure increase in the drilling fluid flowing through the well that can detected by an operator of the downhole abrading tool. The pressure increase provides an indication to the operator of excessive wear on the cutting end of the downhole abrading tool so that the downhole abrading tool can be removed from the well and replaced.
Description
BACKGROUND[0001]1. Field of Invention[0002]The invention is directed to downhole abrading tools utilized in oil and gas wells to abrade objects within the well and, in particular, to downhole mills that are used to abrade, among other objects, stuck tools, bridge plugs, well tubing, and well casing disposed within the well.[0003]2. Description of Art[0004]In the drilling, completion, and workover of oil and gas wells, it is common to perform work downhole in the well bore with a tool which has some sort of wearable working profile interfacing with a downhole structure. Examples would be milling a downhole metal object with a milling tool, performing a washover operation with a rotary shoe, cutting through a tubular with a cutting or milling tool, or drilling through formation with a drill bit. During the performance of these operations, it is common for the working profile of the tool, such as the cutting elements mounted on its lower or outer face, to wear away. As this wear progre...
Claims
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Login to View More IPC IPC(8): E21B29/00
CPCE21B12/02E21B10/00
Inventor GAUDETTE, SEAN L.XU, YANGLYNDE, GERALD
Owner BAKER HUGHES INC